Alkaline Rocks and Carbonatites of the World

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Bambui

stripes

Occurrence number: 
025-00-065
Country: 
Brazil
Region: 
Minas Gerais
Location: 
Longitude: -46, Latitude: -20

At least 12 of a much larger number of radioactive anomalies in the Bambui area prove to be pipes up to about 100 km in diameter, which are usually filled with breccia. The rock of one pipe is described as "soda-minette" but consists of alkali feldspar, aegirine, alkali amphibole, mica, nepheline, secondary analcime, apatite, sphene, pyrite and opaques. They are probably related to the Serra do Bueno necks and dykes lying to the north.

Economic: 
Concentrations of Th and U in which Th>U occur.
References: 
CORREA, G.W. 1971. Diatremas na regiao de Bambui. Anais Congresso Brasileiro de Geologia, 25(1): 103-12
Scratchpads developed and conceived by (alphabetical): Ed Baker, Katherine Bouton Alice Heaton Dimitris Koureas, Laurence Livermore, Dave Roberts, Simon Rycroft, Ben Scott, Vince Smith